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How to treat SMPS9 in TPS6590377

Wolfram Stumpf
Intellectual 445 points
Other Parts Discussed in Thread: TPS659037

Hi there!

According to the data sheet, one has to Options to supply the VIO rail:

  1. use SMPS9
  2. use an external 3.3V supply controlled by REGEN1

For my design, I chose the second approach. Therefore, SMPS9 output ist not used in the design.

Which is the proper way to treat SMPS9?

  1. as in the EVM: supply SMPS9_IN, leave SMPS9_SW and _FBK open and connect SMPS9_GND to GND
  2. as in the TPS659037 Design Checklist: supply SMPS9_IN, leave SMPS9_SW open and connect SMPS9_FBK and _GND to GND
  3. probably something completely different like not supplying SMPS9_IN

Thanks in advance

  Wolfram Stumpf

  • 0
    TI__Genius 16410 points
    Hello Wolfram,

    SMPS9 will be enabled by default in the power-up sequence. Therefore you must supply it and connect the feedback to something. Therefore I would recommend option number 2 - in this case SMPS9_SW will remain high. You can disable SMPS9 through I2C after power-up to reduce quiescent current.

    Regards,
    Karl